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Yep, they all are - when new, at least. But in the practical world, that property may not last for too long; say one- or two disassembles and that's about it - especially if the studs got rusty already and nuts removed without cleaning/chasing the threads, first.
That's why these are said to be...
More important would be that those you got are "self-locking" (distorted) nuts. Hard to tell from your pics...(?)
If it was me I would try to get the exact same size/type nuts. They must be out there, somewhere in the civilian world.
Besides P/N 12301125 I also got many with the P/N 12423477...
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